Simulator implementation using MPI and a Null Message algorithm. More...

#include "null-message-simulator-impl.h"

Inheritance diagram for ns3::NullMessageSimulatorImpl:

Collaboration diagram for ns3::NullMessageSimulatorImpl:

Public Member Functions
	NullMessageSimulatorImpl ()
	Default constructor.

	~NullMessageSimulatorImpl () override
	Destructor.

void	Cancel (const EventId &id) override
	Set the cancel bit on this event: the event's associated function will not be invoked when it expires.

void	Destroy () override
	Execute the events scheduled with ScheduleDestroy().

uint32_t	GetContext () const override
	Get the current simulation context.

Time	GetDelayLeft (const EventId &id) const override
	Get the remaining time until this event will execute.

uint64_t	GetEventCount () const override
	Get the number of events executed.

Time	GetMaximumSimulationTime () const override
	Get the maximum representable simulation time.

uint32_t	GetSystemId () const override
	Get the system id of this simulator.

bool	IsExpired (const EventId &id) const override
	Check if an event has already run or been cancelled.

bool	IsFinished () const override
	Check if the simulation should finish.

Time	Now () const override
	Return the current simulation virtual time.

void	Remove (const EventId &id) override
	Remove an event from the event list.

void	Run () override
	Run the simulation.

EventId	Schedule (const Time &delay, EventImpl *event) override
	Schedule a future event execution (in the same context).

EventId	ScheduleDestroy (EventImpl *event) override
	Schedule an event to run at the end of the simulation, after the Stop() time or condition has been reached.

EventId	ScheduleNow (EventImpl *event) override
	Schedule an event to run at the current virtual time.

void	ScheduleWithContext (uint32_t context, const Time &delay, EventImpl *event) override
	Schedule a future event execution (in a different context).

void	SetScheduler (ObjectFactory schedulerFactory) override
	Set the Scheduler to be used to manage the event list.

void	Stop () override
	Tell the Simulator the calling event should be the last one executed.

EventId	Stop (const Time &delay) override
	Schedule the time delay until the Simulator should stop.

Public Member Functions inherited from ns3::SimulatorImpl
virtual void	PreEventHook (const EventId &id)
	Hook called before processing each event.

Public Member Functions inherited from ns3::Object
	Object ()
	Constructor.

	~Object () override
	Destructor.

void	AggregateObject (Ptr< Object > other)
	Aggregate two Objects together.

void	Dispose ()
	Dispose of this Object.

AggregateIterator	GetAggregateIterator () const
	Get an iterator to the Objects aggregated to this one.

TypeId	GetInstanceTypeId () const override
	Get the most derived TypeId for this Object.

template<typename T >
Ptr< T >	GetObject () const
	Get a pointer to the requested aggregated Object.

template<>
Ptr< Object >	GetObject () const
	Specialization of () for objects of type ns3::Object.

template<typename T >
Ptr< T >	GetObject (TypeId tid) const
	Get a pointer to the requested aggregated Object by TypeId.

template<>
Ptr< Object >	GetObject (TypeId tid) const
	Specialization of (TypeId tid) for objects of type ns3::Object.

void	Initialize ()
	Invoke DoInitialize on all Objects aggregated to this one.

bool	IsInitialized () const
	Check if the object has been initialized.

void	UnidirectionalAggregateObject (Ptr< Object > other)
	Aggregate an Object to another Object.

Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	Default constructor.

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor.

uint32_t	GetReferenceCount () const
	Get the reference count of the object.

SimpleRefCount &	operator= (const SimpleRefCount &o)
	Assignment operator.

void	Ref () const
	Increment the reference count.

void	Unref () const
	Decrement the reference count.

Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
	Virtual destructor.

void	GetAttribute (std::string name, AttributeValue &value, bool permissive=false) const
	Get the value of an attribute, raising fatal errors if unsuccessful.

bool	GetAttributeFailSafe (std::string name, AttributeValue &value) const
	Get the value of an attribute without raising errors.

void	SetAttribute (std::string name, const AttributeValue &value)
	Set a single attribute, raising fatal errors if unsuccessful.

bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)
	Set a single attribute without raising errors.

bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)
	Connect a TraceSource to a Callback with a context.

bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
	Connect a TraceSource to a Callback without a context.

bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected with a context.

bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected without a context.

Static Public Member Functions
static NullMessageSimulatorImpl *	GetInstance ()

static TypeId	GetTypeId ()
	Register this type.

Static Public Member Functions inherited from ns3::SimulatorImpl
static TypeId	GetTypeId ()
	Get the registered TypeId for this class.

Static Public Member Functions inherited from ns3::Object
static TypeId	GetTypeId ()
	Register this type.

Static Public Member Functions inherited from ns3::ObjectBase
static TypeId	GetTypeId ()
	Get the type ID.

Private Types
typedef std::list< EventId >	DestroyEvents
	Container type for the events to run at Simulator::Destroy().

Private Member Functions
Time	CalculateGuaranteeTime (uint32_t systemId)

void	CalculateLookAhead ()
	Calculate the lookahead allowable for this MPI task.

void	CalculateSafeTime ()
	Calculate the SafeTime.

void	DoDispose () override
	Destructor implementation.

Time	GetSafeTime ()
	Get the current SafeTime; the maximum time that events can be processed based on information received from neighboring MPI tasks.

void	HandleArrivingMessagesBlocking ()
	Blocking receive of arriving messages.

void	HandleArrivingMessagesNonBlocking ()
	Non blocking receive of pending messages.

Time	Next () const

void	NullMessageEventHandler (RemoteChannelBundle *bundle)

void	ProcessOneEvent ()
	Process the next event on the queue.

void	RescheduleNullMessageEvent (Ptr< RemoteChannelBundle > bundle)

void	RescheduleNullMessageEvent (uint32_t nodeSysId)

void	ScheduleNullMessageEvent (Ptr< RemoteChannelBundle > bundle)

Private Attributes
uint32_t	m_currentContext
	Execution context of the current event.

uint64_t	m_currentTs
	Timestamp of the current event.

uint32_t	m_currentUid
	Unique id of the current event.

DestroyEvents	m_destroyEvents
	The container of events to run at Destroy()

uint64_t	m_eventCount
	The event count.

Ptr< Scheduler >	m_events
	The event priority queue.

uint32_t	m_myId
	MPI rank.

Time	m_safeTime
	The time for which it is safe for this task to execute events without danger of out-of-order events.

double	m_schedulerTune
	Null Message performance tuning parameter.

bool	m_stop
	Flag calling for the end of the simulation.

uint32_t	m_systemCount
	MPI communicator size.

uint32_t	m_uid
	Next event unique id.

int	m_unscheduledEvents
	Number of events that have been inserted but not yet scheduled, not counting the "destroy" events; this is used for validation.

Static Private Attributes
static NullMessageSimulatorImpl *	g_instance = nullptr
	Singleton instance.

Friends
class	NullMessageEvent

class	NullMessageMpiInterface

class	RemoteChannelBundleManager

Additional Inherited Members
Protected Member Functions inherited from ns3::Object
	Object (const Object &o)
	Copy an Object.

virtual void	DoInitialize ()
	Initialize() implementation.

virtual void	NotifyNewAggregate ()
	Notify all Objects aggregated to this one of a new Object being aggregated.

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)
	Complete construction of ObjectBase; invoked by derived classes.

virtual void	NotifyConstructionCompleted ()
	Notifier called once the ObjectBase is fully constructed.

Related Symbols inherited from ns3::ObjectBase
static TypeId	GetObjectIid ()
	Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly.

Detailed Description

Simulator implementation using MPI and a Null Message algorithm.

Definition at line 39 of file null-message-simulator-impl.h.

Member Typedef Documentation

◆ DestroyEvents

typedef std::list<EventId> ns3::NullMessageSimulatorImpl::DestroyEvents

private

Container type for the events to run at Simulator::Destroy().

Definition at line 173 of file null-message-simulator-impl.h.

Constructor & Destructor Documentation

◆ NullMessageSimulatorImpl()

ns3::NullMessageSimulatorImpl::NullMessageSimulatorImpl ( )

Default constructor.

Definition at line 63 of file null-message-simulator-impl.cc.

References g_instance, ns3::MpiInterface::GetSize(), ns3::MpiInterface::GetSystemId(), ns3::EventId::INVALID, m_currentContext, m_currentTs, m_currentUid, m_eventCount, m_events, m_myId, m_safeTime, m_stop, m_systemCount, m_uid, m_unscheduledEvents, ns3::Simulator::NO_CONTEXT, NS_ASSERT, NS_LOG_FUNCTION, ns3::Seconds(), and ns3::EventId::VALID.

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◆ ~NullMessageSimulatorImpl()

ns3::NullMessageSimulatorImpl::~NullMessageSimulatorImpl ( )

override

Destructor.

Definition at line 85 of file null-message-simulator-impl.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ CalculateGuaranteeTime()

Time ns3::NullMessageSimulatorImpl::CalculateGuaranteeTime ( uint32_t systemId )

private

Parameters

systemId SystemID to compute guarantee time for

Returns: Guarantee time

Calculate the guarantee time for incoming RemoteChannelBundle from task nodeSysId. No message should arrive from task nodeSysId with a receive time less than the guarantee time.

Definition at line 549 of file null-message-simulator-impl.cc.

References ns3::RemoteChannelBundleManager::Find(), GetInstance(), GetSafeTime(), Min, Next(), and NS_ASSERT.

Referenced by ns3::NullMessageMpiInterface::SendPacket().

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◆ CalculateLookAhead()

void ns3::NullMessageSimulatorImpl::CalculateLookAhead ( )

private

Calculate the lookahead allowable for this MPI task.

Basically the minimum latency on links to neighbor MPI tasks.

Add this channel to the remote channel bundle from this task to MPI task on other side of the channel.

Definition at line 125 of file null-message-simulator-impl.cc.

References ns3::RemoteChannelBundleManager::Add(), ns3::NodeContainer::Begin(), ns3::NodeContainer::End(), ns3::RemoteChannelBundleManager::Find(), ns3::TimeValue::Get(), ns3::NodeContainer::GetGlobal(), ns3::MpiInterface::GetSize(), ns3::MpiInterface::GetSystemId(), ns3::NullMessageMpiInterface::InitializeSendReceiveBuffers(), m_safeTime, and NS_LOG_FUNCTION.

Referenced by Run().

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◆ CalculateSafeTime()

void ns3::NullMessageSimulatorImpl::CalculateSafeTime ( )

private

Calculate the SafeTime.

Should be called after message receives.

Definition at line 346 of file null-message-simulator-impl.cc.

References ns3::RemoteChannelBundleManager::GetSafeTime(), m_currentTs, m_safeTime, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by HandleArrivingMessagesBlocking(), and HandleArrivingMessagesNonBlocking().

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◆ Cancel()

void ns3::NullMessageSimulatorImpl::Cancel ( const EventId & id )

overridevirtual

Set the cancel bit on this event: the event's associated function will not be invoked when it expires.

This method has the same visible effect as the ns3::Simulator::Remove method but its algorithmic complexity is much lower: it has O(1) complexity. This method has the exact same semantics as ns3::EventId::Cancel. Note that it is not possible to cancel events which were scheduled for the "destroy" time. Doing so will result in a program error (crash).

Parameters

[in] id the event to cancel

Implements ns3::SimulatorImpl.

Definition at line 496 of file null-message-simulator-impl.cc.

References IsExpired().

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◆ Destroy()

void ns3::NullMessageSimulatorImpl::Destroy ( )

overridevirtual

Execute the events scheduled with ScheduleDestroy().

This method is typically invoked at the end of a simulation to avoid false-positive reports by a leak checker. After this method has been invoked, it is actually possible to restart a new simulation with a set of calls to Simulator::Run, Simulator::Schedule and Simulator::ScheduleWithContext.

Implements ns3::SimulatorImpl.

Definition at line 105 of file null-message-simulator-impl.cc.

References ns3::MpiInterface::Destroy(), ns3::RemoteChannelBundleManager::Destroy(), m_destroyEvents, NS_LOG_FUNCTION, and NS_LOG_LOGIC.

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◆ DoDispose()

void ns3::NullMessageSimulatorImpl::DoDispose ( )

overrideprivatevirtual

Destructor implementation.

This method is called by Dispose() or by the Object's destructor, whichever comes first.

Subclasses are expected to implement their real destruction code in an overridden version of this method and chain up to their parent's implementation once they are done. i.e, for simplicity, the destructor of every subclass should be empty and its content should be moved to the associated DoDispose() method.

It is safe to call GetObject() from within this method.

Reimplemented from ns3::Object.

Definition at line 91 of file null-message-simulator-impl.cc.

References ns3::Object::DoDispose(), ns3::Scheduler::Event::impl, m_events, NS_LOG_FUNCTION, and ns3::SimpleRefCount< T, PARENT, DELETER >::Unref().

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◆ GetContext()

uint32_t ns3::NullMessageSimulatorImpl::GetContext ( ) const

overridevirtual

Get the current simulation context.

The simulation context is the ns-3 notion of a Logical Process. Events in a single context should only modify state associated with that context. Events for objects in other contexts should be scheduled with ScheduleWithContext() to track the context switches. In other words, events in different contexts should be mutually thread safe, by not modify overlapping model state.

In circumstances where the context can't be determined, such as during object initialization, the enum value NO_CONTEXT should be used.

Returns: The current simulation context

Implements ns3::SimulatorImpl.

Definition at line 537 of file null-message-simulator-impl.cc.

References m_currentContext.

Referenced by Schedule().

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◆ GetDelayLeft()

Time ns3::NullMessageSimulatorImpl::GetDelayLeft ( const EventId & id ) const

overridevirtual

Get the remaining time until this event will execute.

Parameters

[in] id The event id to analyse.

Returns: The delay left until the input event id expires. if the event is not running, this method returns zero.

Implements ns3::SimulatorImpl.

Definition at line 450 of file null-message-simulator-impl.cc.

References IsExpired(), and m_currentTs.

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◆ GetEventCount()

uint64_t ns3::NullMessageSimulatorImpl::GetEventCount ( ) const

overridevirtual

Get the number of events executed.

Returns: The total number of events executed.

Implements ns3::SimulatorImpl.

Definition at line 543 of file null-message-simulator-impl.cc.

References m_eventCount.

◆ GetInstance()

NullMessageSimulatorImpl * ns3::NullMessageSimulatorImpl::GetInstance ( )

static

Returns: singleton instance

Singleton accessor.

Definition at line 569 of file null-message-simulator-impl.cc.

References g_instance, and NS_ASSERT.

Referenced by CalculateGuaranteeTime(), ns3::RemoteChannelBundleManager::InitializeNullMessageEvents(), and ns3::NullMessageMpiInterface::SendPacket().

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◆ GetMaximumSimulationTime()

Time ns3::NullMessageSimulatorImpl::GetMaximumSimulationTime ( ) const

overridevirtual

Get the maximum representable simulation time.

Returns: The maximum simulation time at which an event can be scheduled.

The returned value will always be bigger than or equal to Simulator::Now.

Implements ns3::SimulatorImpl.

Definition at line 529 of file null-message-simulator-impl.cc.

◆ GetSafeTime()

Time ns3::NullMessageSimulatorImpl::GetSafeTime ( )

private

Get the current SafeTime; the maximum time that events can be processed based on information received from neighboring MPI tasks.

Returns: the current SafeTime

Definition at line 355 of file null-message-simulator-impl.cc.

References m_safeTime.

Referenced by CalculateGuaranteeTime(), NullMessageEventHandler(), and Run().

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◆ GetSystemId()

uint32_t ns3::NullMessageSimulatorImpl::GetSystemId ( ) const

overridevirtual

Get the system id of this simulator.

The system id is the identifier for this simulator instance in a distributed simulation. For MPI this is the MPI rank.

Returns: The system id for this simulator.

Implements ns3::SimulatorImpl.

Definition at line 361 of file null-message-simulator-impl.cc.

References m_myId.

◆ GetTypeId()

TypeId ns3::NullMessageSimulatorImpl::GetTypeId ( )

static

Register this type.

Returns: The object TypeId.

Definition at line 48 of file null-message-simulator-impl.cc.

References m_schedulerTune, ns3::MakeDoubleAccessor(), ns3::MakeDoubleChecker(), and ns3::TypeId::SetParent().

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◆ HandleArrivingMessagesBlocking()

void ns3::NullMessageSimulatorImpl::HandleArrivingMessagesBlocking ( )

private

Blocking receive of arriving messages.

Definition at line 333 of file null-message-simulator-impl.cc.

References CalculateSafeTime(), NS_LOG_FUNCTION, ns3::NullMessageMpiInterface::ReceiveMessagesBlocking(), and ns3::NullMessageMpiInterface::TestSendComplete().

Referenced by Run().

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◆ HandleArrivingMessagesNonBlocking()

void ns3::NullMessageSimulatorImpl::HandleArrivingMessagesNonBlocking ( )

private

Non blocking receive of pending messages.

Definition at line 320 of file null-message-simulator-impl.cc.

References CalculateSafeTime(), NS_LOG_FUNCTION, ns3::NullMessageMpiInterface::ReceiveMessagesNonBlocking(), and ns3::NullMessageMpiInterface::TestSendComplete().

Referenced by Run().

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◆ IsExpired()

bool ns3::NullMessageSimulatorImpl::IsExpired ( const EventId & id ) const

overridevirtual

Check if an event has already run or been cancelled.

This method has O(1) complexity. Note that it is not possible to test for the expiration of events which were scheduled for the "destroy" time. Doing so will result in a program error (crash). An event is said to "expire" when it starts being executed, which means that if the code executed by the event calls this function, it will get true.

Parameters

[in] id The event to test for expiration.

Returns: true if the event has expired, false otherwise.

Implements ns3::SimulatorImpl.

Definition at line 505 of file null-message-simulator-impl.cc.

References ns3::EventId::DESTROY, m_currentTs, m_currentUid, and m_destroyEvents.

Referenced by Cancel(), GetDelayLeft(), and Remove().

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◆ IsFinished()

bool ns3::NullMessageSimulatorImpl::IsFinished ( ) const

overridevirtual

Check if the simulation should finish.

Reasons to finish are because there are no more events lefts to be scheduled, or if simulation time has already reached the "stop time" (see Simulator::Stop()).

Returns: true if no more events or stop time reached.

Implements ns3::SimulatorImpl.

Definition at line 236 of file null-message-simulator-impl.cc.

References m_events, and m_stop.

Referenced by Run().

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◆ Next()

Time ns3::NullMessageSimulatorImpl::Next ( ) const

private

Returns: next local event time.

Definition at line 242 of file null-message-simulator-impl.cc.

References ns3::Scheduler::Event::key, m_events, ns3::Scheduler::EventKey::m_ts, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by CalculateGuaranteeTime(), NullMessageEventHandler(), and Run().

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◆ Now()

Time ns3::NullMessageSimulatorImpl::Now ( ) const

overridevirtual

Return the current simulation virtual time.

Returns: The current virtual time.

Implements ns3::SimulatorImpl.

Definition at line 444 of file null-message-simulator-impl.cc.

References m_currentTs.

◆ NullMessageEventHandler()

void ns3::NullMessageSimulatorImpl::NullMessageEventHandler ( RemoteChannelBundle * bundle )

private

Parameters

bundle remote channel bundle to schedule an event for.

Null message event handler. Scheduled to send a null message for the specified bundle at regular intervals. Will canceled and rescheduled when packets are sent.

Definition at line 558 of file null-message-simulator-impl.cc.

References ns3::RemoteChannelBundle::GetDelay(), GetSafeTime(), Min, Next(), NS_LOG_FUNCTION, ScheduleNullMessageEvent(), and ns3::NullMessageMpiInterface::SendNullMessage().

Referenced by RescheduleNullMessageEvent(), and ScheduleNullMessageEvent().

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◆ ProcessOneEvent()

void ns3::NullMessageSimulatorImpl::ProcessOneEvent ( )

private

Process the next event on the queue.

Definition at line 215 of file null-message-simulator-impl.cc.

References ns3::Scheduler::Event::impl, ns3::EventImpl::Invoke(), ns3::Scheduler::Event::key, ns3::Scheduler::EventKey::m_context, m_currentContext, m_currentTs, m_currentUid, m_eventCount, m_events, ns3::Scheduler::EventKey::m_ts, ns3::Scheduler::EventKey::m_uid, m_unscheduledEvents, NS_ASSERT, NS_LOG_FUNCTION, NS_LOG_LOGIC, ns3::SimulatorImpl::PreEventHook(), and ns3::SimpleRefCount< T, PARENT, DELETER >::Unref().

Referenced by Run().

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◆ Remove()

void ns3::NullMessageSimulatorImpl::Remove ( const EventId & id )

overridevirtual

Remove an event from the event list.

This method has the same visible effect as the ns3::EventId::Cancel method but its algorithmic complexity is much higher: it has often O(log(n)) complexity, sometimes O(n), sometimes worse. Note that it is not possible to remove events which were scheduled for the "destroy" time. Doing so will result in a program error (crash).

Parameters

[in] id The event to remove from the list of scheduled events.

Implements ns3::SimulatorImpl.

Definition at line 463 of file null-message-simulator-impl.cc.

References ns3::EventImpl::Cancel(), ns3::EventId::DESTROY, ns3::Scheduler::Event::impl, IsExpired(), m_destroyEvents, m_events, and m_unscheduledEvents.

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◆ RescheduleNullMessageEvent() [1/2]

void ns3::NullMessageSimulatorImpl::RescheduleNullMessageEvent ( Ptr< RemoteChannelBundle > bundle )

private

Parameters

bundle Bundle to reschedule Null Message event for

Reschedule Null Message event for the specified RemoteChannelBundle. Existing event will be canceled.

Definition at line 266 of file null-message-simulator-impl.cc.

References ns3::Simulator::Cancel(), m_schedulerTune, NS_LOG_FUNCTION, NullMessageEventHandler(), ns3::PeekPointer(), and ns3::Simulator::Schedule().

Referenced by RescheduleNullMessageEvent(), and ns3::NullMessageMpiInterface::SendPacket().

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◆ RescheduleNullMessageEvent() [2/2]

void ns3::NullMessageSimulatorImpl::RescheduleNullMessageEvent ( uint32_t nodeSysId )

private

Parameters

nodeSysId SystemID to reschedule null event for

Reschedule Null Message event for the RemoteChannelBundle to the task nodeSysId. Existing event will be canceled.

Definition at line 281 of file null-message-simulator-impl.cc.

References ns3::RemoteChannelBundleManager::Find(), NS_ASSERT, NS_LOG_FUNCTION, and RescheduleNullMessageEvent().

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◆ Run()

void ns3::NullMessageSimulatorImpl::Run ( )

overridevirtual

Run the simulation.

The simulation will run until one of:

No events are present anymore
The user called Simulator::Stop
The user called Simulator::Stop with a stop time and the expiration time of the next event to be processed is greater than or equal to the stop time.

Implements ns3::SimulatorImpl.

Definition at line 292 of file null-message-simulator-impl.cc.

References CalculateLookAhead(), GetSafeTime(), HandleArrivingMessagesBlocking(), HandleArrivingMessagesNonBlocking(), ns3::RemoteChannelBundleManager::InitializeNullMessageEvents(), IsFinished(), m_stop, Next(), NS_LOG_FUNCTION, and ProcessOneEvent().

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◆ Schedule()

EventId ns3::NullMessageSimulatorImpl::Schedule	(	const Time &	delay,
		EventImpl *	event )

overridevirtual

Schedule a future event execution (in the same context).

Parameters

[in]	delay	Delay until the event expires.
[in]	event	The event to schedule.

Returns: A unique identifier for the newly-scheduled event.

Implements ns3::SimulatorImpl.

Definition at line 386 of file null-message-simulator-impl.cc.

References GetContext(), ns3::Time::GetTimeStep(), ns3::Scheduler::Event::impl, ns3::Time::IsPositive(), ns3::Scheduler::Event::key, ns3::Scheduler::EventKey::m_context, m_currentTs, m_events, ns3::Scheduler::EventKey::m_ts, m_uid, ns3::Scheduler::EventKey::m_uid, m_unscheduledEvents, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by ScheduleNow().

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◆ ScheduleDestroy()

EventId ns3::NullMessageSimulatorImpl::ScheduleDestroy ( EventImpl * event )

overridevirtual

Schedule an event to run at the end of the simulation, after the Stop() time or condition has been reached.

Parameters

[in] event The event to schedule.

Returns: A unique identifier for the newly-scheduled event.

Implements ns3::SimulatorImpl.

Definition at line 433 of file null-message-simulator-impl.cc.

References m_currentTs, m_destroyEvents, m_uid, and NS_LOG_FUNCTION.

◆ ScheduleNow()

EventId ns3::NullMessageSimulatorImpl::ScheduleNow ( EventImpl * event )

overridevirtual

Schedule an event to run at the current virtual time.

Parameters

[in] event The event to schedule.

Returns: A unique identifier for the newly-scheduled event.

Implements ns3::SimulatorImpl.

Definition at line 426 of file null-message-simulator-impl.cc.

References NS_LOG_FUNCTION, and Schedule().

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◆ ScheduleNullMessageEvent()

void ns3::NullMessageSimulatorImpl::ScheduleNullMessageEvent ( Ptr< RemoteChannelBundle > bundle )

private

Parameters

bundle Bundle to schedule Null Message event for

Schedule Null Message event for the specified RemoteChannelBundle.

Definition at line 253 of file null-message-simulator-impl.cc.

References m_schedulerTune, NS_LOG_FUNCTION, NullMessageEventHandler(), ns3::PeekPointer(), and ns3::Simulator::Schedule().

Referenced by ns3::RemoteChannelBundleManager::InitializeNullMessageEvents(), and NullMessageEventHandler().

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◆ ScheduleWithContext()

void ns3::NullMessageSimulatorImpl::ScheduleWithContext	(	uint32_t	context,
		const Time &	delay,
		EventImpl *	event )

overridevirtual

Schedule a future event execution (in a different context).

This method is thread-safe: it can be called from any thread.

Parameters

[in]	delay	Delay until the event expires.
[in]	context	Event context.
[in]	event	The event to schedule.

Implements ns3::SimulatorImpl.

Definition at line 406 of file null-message-simulator-impl.cc.

References ns3::Time::GetTimeStep(), ns3::Scheduler::Event::impl, ns3::Time::IsPositive(), ns3::Scheduler::Event::key, ns3::Scheduler::EventKey::m_context, m_currentTs, m_events, ns3::Scheduler::EventKey::m_ts, m_uid, ns3::Scheduler::EventKey::m_uid, m_unscheduledEvents, NS_ASSERT, and NS_LOG_FUNCTION.

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◆ SetScheduler()

void ns3::NullMessageSimulatorImpl::SetScheduler ( ObjectFactory schedulerFactory )

overridevirtual

Set the Scheduler to be used to manage the event list.

Parameters

[in] schedulerFactory A new event scheduler factory.

The event scheduler can be set at any time: the events scheduled in the previous scheduler will be transferred to the new scheduler before we start to use it.

Implements ns3::SimulatorImpl.

Definition at line 197 of file null-message-simulator-impl.cc.

References ns3::ObjectFactory::Create(), m_events, and NS_LOG_FUNCTION.

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◆ Stop() [1/2]

void ns3::NullMessageSimulatorImpl::Stop ( )

overridevirtual

Tell the Simulator the calling event should be the last one executed.

If a running event invokes this method, it will be the last event executed by the Simulator::Run method before returning to the caller.

Implements ns3::SimulatorImpl.

Definition at line 367 of file null-message-simulator-impl.cc.

References m_stop, and NS_LOG_FUNCTION.

◆ Stop() [2/2]

EventId ns3::NullMessageSimulatorImpl::Stop ( const Time & delay )

overridevirtual

Schedule the time delay until the Simulator should stop.

Force the Simulator::Run method to return to the caller when the expiration time of the next event to be processed is greater than or equal to the stop time. The stop time is relative to the current simulation time.

Parameters

[in] delay The stop time, relative to the current time.

Returns: The stop EventId.

Implements ns3::SimulatorImpl.

Definition at line 375 of file null-message-simulator-impl.cc.

References ns3::Time::GetTimeStep(), NS_LOG_FUNCTION, ns3::Simulator::Schedule(), and ns3::Simulator::Stop().

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Friends And Related Symbol Documentation

◆ NullMessageEvent

friend class NullMessageEvent

friend

Definition at line 84 of file null-message-simulator-impl.h.

◆ NullMessageMpiInterface

friend class NullMessageMpiInterface

friend

Definition at line 85 of file null-message-simulator-impl.h.

◆ RemoteChannelBundleManager

friend class RemoteChannelBundleManager

friend

Definition at line 86 of file null-message-simulator-impl.h.

Member Data Documentation

◆ g_instance

NullMessageSimulatorImpl * ns3::NullMessageSimulatorImpl::g_instance = nullptr

staticprivate

Singleton instance.

Definition at line 220 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), and GetInstance().

◆ m_currentContext

uint32_t ns3::NullMessageSimulatorImpl::m_currentContext

private

Execution context of the current event.

Definition at line 189 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), GetContext(), and ProcessOneEvent().

◆ m_currentTs

uint64_t ns3::NullMessageSimulatorImpl::m_currentTs

private

Timestamp of the current event.

Definition at line 187 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), CalculateSafeTime(), GetDelayLeft(), IsExpired(), Now(), ProcessOneEvent(), Schedule(), ScheduleDestroy(), and ScheduleWithContext().

◆ m_currentUid

uint32_t ns3::NullMessageSimulatorImpl::m_currentUid

private

Unique id of the current event.

Definition at line 185 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), IsExpired(), and ProcessOneEvent().

◆ m_destroyEvents

DestroyEvents ns3::NullMessageSimulatorImpl::m_destroyEvents

private

The container of events to run at Destroy()

Definition at line 176 of file null-message-simulator-impl.h.

Referenced by Destroy(), IsExpired(), Remove(), and ScheduleDestroy().

◆ m_eventCount

uint64_t ns3::NullMessageSimulatorImpl::m_eventCount

private

The event count.

Definition at line 191 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), GetEventCount(), and ProcessOneEvent().

◆ m_events

Ptr<Scheduler> ns3::NullMessageSimulatorImpl::m_events

private

The event priority queue.

Definition at line 180 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), DoDispose(), IsFinished(), Next(), ProcessOneEvent(), Remove(), Schedule(), ScheduleWithContext(), and SetScheduler().

◆ m_myId

uint32_t ns3::NullMessageSimulatorImpl::m_myId

private

MPI rank.

Definition at line 198 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), and GetSystemId().

◆ m_safeTime

Time ns3::NullMessageSimulatorImpl::m_safeTime

private

The time for which it is safe for this task to execute events without danger of out-of-order events.

Definition at line 205 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), CalculateLookAhead(), CalculateSafeTime(), and GetSafeTime().

◆ m_schedulerTune

double ns3::NullMessageSimulatorImpl::m_schedulerTune

private

Null Message performance tuning parameter.

Controls when Null messages are sent. When value is 1 the minimum number of Null messages are sent conserving bandwidth. The delay in arrival of lookahead information is the greatest resulting in maximum unnecessary blocking of the receiver. When the value is near 0 Null Messages are sent with high frequency, costing more bandwidth and Null Message processing time, but there is minimum unnecessary block of the receiver.

Definition at line 217 of file null-message-simulator-impl.h.

Referenced by GetTypeId(), RescheduleNullMessageEvent(), and ScheduleNullMessageEvent().

◆ m_stop

bool ns3::NullMessageSimulatorImpl::m_stop

private

Flag calling for the end of the simulation.

Definition at line 178 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), IsFinished(), Run(), and Stop().

◆ m_systemCount

uint32_t ns3::NullMessageSimulatorImpl::m_systemCount

private

MPI communicator size.

Definition at line 199 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl().

◆ m_uid

uint32_t ns3::NullMessageSimulatorImpl::m_uid

private

Next event unique id.

Definition at line 183 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), Schedule(), ScheduleDestroy(), and ScheduleWithContext().

◆ m_unscheduledEvents

int ns3::NullMessageSimulatorImpl::m_unscheduledEvents

private

Number of events that have been inserted but not yet scheduled, not counting the "destroy" events; this is used for validation.

Definition at line 196 of file null-message-simulator-impl.h.

Referenced by NullMessageSimulatorImpl(), ProcessOneEvent(), Remove(), Schedule(), and ScheduleWithContext().

The documentation for this class was generated from the following files:

src/mpi/model/null-message-simulator-impl.h
src/mpi/model/null-message-simulator-impl.cc

Public Member Functions

Static Public Member Functions

Private Types

Private Member Functions

Private Attributes

Static Private Attributes

Friends

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ DestroyEvents

Constructor & Destructor Documentation

◆ NullMessageSimulatorImpl()

◆ ~NullMessageSimulatorImpl()

Member Function Documentation

◆ CalculateGuaranteeTime()

◆ CalculateLookAhead()

◆ CalculateSafeTime()

◆ Cancel()

◆ Destroy()

◆ DoDispose()

◆ GetContext()

◆ GetDelayLeft()

◆ GetEventCount()

◆ GetInstance()

◆ GetMaximumSimulationTime()

◆ GetSafeTime()

◆ GetSystemId()

◆ GetTypeId()

◆ HandleArrivingMessagesBlocking()

◆ HandleArrivingMessagesNonBlocking()

◆ IsExpired()

◆ IsFinished()

◆ Next()

◆ Now()

◆ NullMessageEventHandler()

◆ ProcessOneEvent()

◆ Remove()

◆ RescheduleNullMessageEvent() [1/2]

◆ RescheduleNullMessageEvent() [2/2]

◆ Run()

◆ Schedule()

◆ ScheduleDestroy()

◆ ScheduleNow()

◆ ScheduleNullMessageEvent()

◆ ScheduleWithContext()

◆ SetScheduler()

◆ Stop() [1/2]

◆ Stop() [2/2]

Friends And Related Symbol Documentation

◆ NullMessageEvent

◆ NullMessageMpiInterface

◆ RemoteChannelBundleManager

Member Data Documentation

◆ g_instance

◆ m_currentContext

◆ m_currentTs

◆ m_currentUid

◆ m_destroyEvents

◆ m_eventCount

◆ m_events

◆ m_myId

◆ m_safeTime

◆ m_schedulerTune

◆ m_stop

◆ m_systemCount

◆ m_uid

◆ m_unscheduledEvents